There are many ways in which you can top up your mobile

Important Note
If you top up using vouchers, or in your local shop using E Top-up, you can top up by up to £50 at once. You can top up by voucher and E Top-up as often as you like, there is no limit to the amount you can top up.

The maximum amount you can top up your mobile with your credit/debit card is £100 every 30 days. In addition there is a £30 limit per 24 hours. If you have already topped up to this level with a credit/debit card then you will need to use one of our other top-up methods such as E Top-up, cash machine top-up or vouchers.

Whenever you go abroad it's a good idea to top-up your mobile before you leave.

If you need to top-up from overseas you have a number of easy options:

• You can take an O2 voucher with you
• Use your credit/debit card
• Top-up online through our website

To check your balance use Hotkey 2 or key *#10# then press the call button and your calltime balance will be shown on your display. Alternatively dial 4444 FREE from your mobile to hear your balance and to top-up.

You need at least 1 minute of calltime credit to make a call. When your calltime falls too low, you'll get messages indicating you're nearly out of credit until you're finally diverted to the O2 top-up line.

Your anniversary date relates to your tariff and any Bolt Ons you may have. It is the date every month when your tariff allowances restart (depending on your top ups) and it is also the date that any Bolt Ons are renewed (depending on whether you have enough credit for the monthly payment from your call time credit).

If you want to keep the same anniversary date for your tariff, you need to top-up your account with a minimum of £10 each month before your anniversary date. You will receive a text message reminding you to top up. If you top-up after your anniversary date, then your anniversary date will change to the date you topped up.

Similarly for your Bolt Ons. If you have not got enough Calltime credit on your Anniversary date, then when you next top up, the payment for your Bolt On will be taken and your Bolt On will restart on that day. This will become your new Anniversary date.

You can send a SMS with the word "balance" to 20202, or call 4444 free and select option 2,2 to find out your anniversary dates. You will be told your remaining tariff free allowance and/or Bolt On balance (depending on what you have on your account) and the date when these will expire – your anniversay date.

Tariff and Bolt On anniversary dates will be different dates in the month depending on when you set up your tariff or any Bolt Ons you have.

It’s a way of topping up your mobile automatically, so you don’t have to remember to do it. You can choose between regular top-up and low balance top-up.

If something goes wrong with your auto top-up, we’ll text and email you to let you know it hasn’t worked. You can do a one-off online top-up at My O2 or call 4444 free from your O2 mobile.

You should receive your top-up credit straight away. If you do experience a slight delay with your payment being authorised, we will continue trying to complete your transaction. If this is successful, we will send a confirmation text within 5 minutes to the O2 mobile you've topped up.

The maximum that you can accrue each quarter O2 Rewards period is £150.

The maximum that you're able to save to your saved rewards balance is £550

If you are looking to upgrade your phone, don’t forget you could use your saved Rewards to get a discount on our latest range of phones and accessories.  Go to O2 Rewards to see how much you have saved up or to register so that you can start earning up to 10% back every time you top up your phone.

Don't forget. Make sure that you tell the store advisor that you wish to use your saved rewards when visiting the store to upgrade.

If you’re already a Pay & Go customer, you can join simplicity by calling 2202 free from your mobile or texting in the relevant keyword, free to 21300. Remember, with simplicity we take the payment from your credit each month and give you your allowance.

If you’re not with O2 yet, you can go into an O2 store or go to o2.co.uk and get a free simplicity sim. Then choose your allowance by texting the relevant keyword to 21300 or calling 2202, from your O2 mobile.

• Unlimited texts for £7.50 a month – text CHOOSE TEXT
• Unlimited texts + 100MB web for £10.50 a month – text CHOOSE BASIC
• Unlimited texts + 500MB web for £13.50 a month – text CHOOSE ROUND
• Unlimited texts + 1GB web for £17.50 a month – text CHOOSE WORKS
• 500 texts + 100 UK minutes for £10.50 a month – text CHOOSE 100
• 500 texts + 100 UK minutes + 100MB web for £13.50 a month – text CHOOSE 100 BASIC
• 500 texts + 100 UK minutes + 500MB web for £16.50 a month – text CHOOSE 100 ROUND
• 500 texts + 100 UK minutes + 1GB web for £20.50 a month – text CHOOSE 100 WORKS
• Unlimited texts + 300 UK minutes for £15.50 a month – text CHOOSE 300 to 21300
• Unlimited texts + 300 UK minutes + 100MB web for £18.50 a month – text CHOOSE 300 BASIC
• Unlimited texts + 300 UK minutes + 500MB web for £21.50 a month – text CHOOSE 300 ROUND
• Unlimited texts + 300 UK minutes + 1GB web for £25.50 a month – text CHOOSE 300 WORKS